I am currently building a cart system on my mongodb ecommerce app. I need help on how to query and compare array.
here document of cart:
{
"_id" : ObjectId("5d0531e27c8fa1029017ea20"),
"user" : ObjectId("5d0371319315c715fc34b0b0"),
"active" : true,
"item" : [
{
"product" : ObjectId("5d013eb63a2bdd11a46c8dd3"),
"option" : [
{
"name" : "Ukuran",
"value" : "Biru"
}
],
"quantity" : 1
},
{
"product" : ObjectId("5d013eb63a2bdd11a46c8dd3"),
"option" : [
{
"name" : "Ukuran",
"value" : "Biru"
}
],
"quantity" : 1
}
],
"created_at" : ISODate("2019-06-15T17:58:58.762Z"),
"updated_at" : ISODate("2019-06-15T17:59:13.334Z"),
"__v" : 0
}
I want to compare object of item.option field, so my cart system is if cart on database have same object option i will add quantity, otherwise push new object to item.
so current I am not asking on how to implement my cart system, but I want to compare each item.option object
I've already tried this
const cart = await CartModel.find({
"item.option": option
})
and get error Error: Query filter must be an object, got an array
Solved by myself, after many experiment finally i combine $in and $elemMatch for compare each array of object
// this is will dynamic
const optionArray = [
{
"name": "Warna",
"value": "Biru"
},
{
"name": "Ukuran",
"value": "XL"
}
]
const compareOptionQuery = []
for (let i = 0; i < optionArray.length; i++) {
compareOptionQuery.push({
$elemMatch: {
...option[i]
}
})
}
const cart = await CartModel.aggregate([
{
$and: [
{
_id: cartId,
user: userId
},
{
'item.option': {
$in: [...compareOptionQuery]
}
}
]
}
])
The issue with your implementation is that in CartModel.find("item.option": option) your filter (first parameter) encounters an array instead of an object.
This is because you are trying to call for an object option from item, however option is as element of an array field item.
If you wish to access item from an array field, you must specify conditions on the elements in the array field item using {<array field>: {<operator1>: <value1>}} like so:
CartModel.find({
item: {$option: option}
})
Related
I have two collections data like below . I need compare the two collections data and get the data if the data is same . Tried with below query but is it not giving any results .I am new to mongodb query ,Can anyone help me how to get the code key values if the data is same in both collections .The query is not returning any errors but the code values are not getting populated to new cllection
**Collection 1:**
{
"_id" : {
"value" : "12345"
},
"value" : {
"Identifier" : "12345",
"statu" : "simple",
"code" : {
"key" : "US",
"value" : "United State of America"
},
"Code" : {
"key" : "UK",
"value" : "London"
}
}
**Collection 2** :
{
"_id" : ObjectId("12345"),
"value" : {
"Identifier" : "12345",
"statu" : "simple",
"code" : {
"key" : "US",
"value" : "United State of America"
},
"Code" : {
"key" : "UK",
"value" : "London"
}
},
}
Mongo DB :
var identifiers = db.getSiblingDB("Datbase").getCollection("Collection1").find({
$or:[
{'code':{$exists:true}},
{'Code1':{$exists:true}},
]
}).toArray()
var bulk = db.getSiblingDB("Database2").getCollection("Collection2").initializeUnorderedBulkOp()
identifiers.forEach(Identifier =>{
db.getSiblingDB("Database2").getCollection("Collection2").aggregate([
{
$match:{
"Identifier":'$Identifier',
}
},
{
"$group" : {
"_id" : {
"Identifier":'$Identifier',
"key" : "$code.key",
"value" : "$code.value",
"key1" : "$code1.key1",
"value1" : "$code1.value2",
}
}
}, {
$merge:{
into:{
db:'Database',
coll:'Collection'
}
}
}
])
})
Using cursor get one by one items from 1st collection
For every item from 1st collection query 2nd collection for existense
If item does not exist or it's body is different (Use lodash.isEqual method) push them to some array or use replaceOne method to insert or replace document. (install lodash: npm i --save lodash)
const _ = require('lodash'); // import it at top
(async () => { // You can remove it if Your code already inside async scope
const source = db.getSiblingDB("Datbase").getCollection("Collection1");
const destination = db.getSiblingDB("Datbase").getCollection("Collection2");
const query = {$or:[
{'code':{$exists:true}},
{'Code1':{$exists:true}},
]};
const cursor = await source.find(query);
const differentItems = [];
// iterating source collection items
while(await cursor.hasNext()) {
const src = await cursor.next(); // source collectio inem
const queryDestination = {
"Identifier": src.Identifier, // extend Your equality constrains here
};
const dest = await destination.findOne(queryDestination);
// it may not exist || may be different (not equal)
const isDifferent = !dest || !(
_.isEqual(
_.omit(src, ['_id']),
_.omit(dest, ['_id'])
)
);
if (isDifferent) {
differentItems.push({src, dest});
/* or replace in db
await destination.replaceOne(
queryDestination,
_.omit(src, ['_id']),
{
upsert: true,
}
);
*/
}
}
console.log(`found ${differentItems.length} different documments`);
console.log(JSON.stringify(differentItems, null, 4));
)();
I'm updating the age and name of a character with a specific _id from an array of characters that is inside a document of model Drama.
The document I'm working with:-
{
"_id" : ObjectId("619d44d2ec2ca20ca0404b5a"),
"characters" : [
{
"_id" : ObjectId("619fdac5a03c8b10d0b8b13c"),
"age" : "23",
"name" : "Vinay",
},
{
"_id" : ObjectId("619fe1d53810a130207a409d"),
"age" : "25",
"name" : "Raghu",
},
{
"_id" : ObjectId("619fe1d53810a130207a502v"),
"age" : "27",
"name" : "Teju",
}
],
}
So to update the character Raghu I did this:-
const characterObj = {
age: "26",
name: "Dr. Raghu",
};
Drama.updateOne(
{ _id: req.drama._id, "characters._id": characterId },
{
$set: {
"characters.$": characterObj,
},
},
function(err, foundlist) {
if (err) {
console.log(err);
} else {
console.log("Update completed");
}
}
);
// req.drama._id is ObjectId("619d44d2ec2ca20ca0404b5a")
// characterId is ObjectId("619fe1d53810a130207a409d")
This updated the character but it also assigned a new ObjectId to the _id field of the character. So, I'm looking for ways on how to prevent the _id update.
Also, I know I can set the individual fields of character instead of assigning a whole new object to prevent that but it will be very tedious if my character's object has a lot of fields.
//Not looking to do it this way
$set: {
"characters.$.age": characterObj.age,
"characters.$.name": characterObj.name,
},
Thanks.
I found something here, just pre define a schema (a blueprint in a way) that affects the id
var subSchema = mongoose.Schema({
//your subschema content
},{ _id : false });
Stop Mongoose from creating _id property for sub-document array items
Or I would say, when you create a character assign it a custom id from the start, that way it will retain that id throughout.
I'm leaving this question open as I would still like to see a simpler approach. But for now, I did find one easy alternative solution for this issue which I'm will be using for some time now until I find a more direct approach.
In short - Deep merge the new object in the old object using lodash and then use the new merged object to set field value.
For example, let's update the character Raghu from my question document:-
First install lodash(Required for deep merging objects) using npm:
$ npm i -g npm
$ npm i --save lodash
Import lodash:
const _ = require("lodash");
Now update the character Raghu like this:-
const newCharacterObj = {
age: "26",
name: "Dr. Raghu",
};
Drama.findById(
{ _id: req.drama._id, "characters._id": characterId },
"characters.$",
function(err, dramaDocWithSpecificCharacter) {
console.log(dramaDocWithSpecificCharacter);
// ↓↓↓ console would log ↓↓↓
// {
// "_id" : ObjectId("619d44d2ec2ca20ca0404b5a"),
// "characters" : [
// {
// "_id" : ObjectId("619fe1d53810a130207a409d"),
// "age" : "25",
// "name" : "Raghu",
// }
// ],
// }
const oldCharacterObj = dramaDocWithSpecificCharacter.characters[0];
const mergedCharacterObjs = _.merge(oldCharacterObj, newCharacterObj);
// _.merge() returns a deep merged object
console.log(mergedCharacterObjs);
// ↓↓↓ console would log ↓↓↓
// {
// _id: 619fe1d53810a130207a409d,
// age: "26",
// name: "Dr. Raghu",
// };
Drama.updateOne(
{ _id: req.drama._id, "characters._id": characterId },
{
$set: {
"characters.$": mergedCharacterObjs,
},
},
function(err, foundlist) {
if (err) {
console.log(err);
} else {
console.log("Update completed");
}
}
);
}
);
// req.drama._id is ObjectId("619d44d2ec2ca20ca0404b5a")
// characterId is ObjectId("619fe1d53810a130207a409d")
Note: We can also use the native Object.assign() or … (spread operator) to merge objects but the downside of it is that it doesn’t merge nested objects which could cause issues if you later decide to add nested objects without making changes for deep merge.
You can pass your payload or request body like this if we provide _id it will prevent update to nested document
"characters" : [
{
"_id" : "619fdac5a03c8b10d0b8b13c",
"age" : "updated value",
"name" : "updated value",
}, {
"_id" : "619fe1d53810a130207a409d",
"age" : "updated value",
"name" : "updated value",
}, {
"_id" : "619fe1d53810a130207a502v",
"age" : "updated value",
"name" : "updated value",
}
],
It works for me for bulk update in array object
I have an object user that looks like that
{
"_id" : ObjectId("5edbdf57ac52325464b054ec"),
...
"purchaseHistory" : [
{
"_id" : ObjectId("5ee7a8f6b438a1254cec3f74"),
...
},
{
"_id" : ObjectId("5ee7a8f6b438a1254cec3f88"),
...
}
]
}
What I wanna do is to add a new field to a specific object inside "purchaseHistory" by ID, for example I wanna add to "5ee7a8f6b438a1254cec3f88" a field "status": 0
What I tried is
users.findOneAndUpdate(
{
_id: ObjectId(userId),
'purchaseHistory._id': ObjectId(saleId)
},
{
$set: { 'purchaseHistory.$.status': status}
}
)
But it gives me an error, how can I do it properly?
According to the website provided by D. SM, I was able to do it this way
users.findOneAndUpdate(
{
'_id': ObjectId(userId),
'purchaseHistory._id': ObjectId(saleId)
},
{
$set: { 'purchaseHistory.$.status': status }
}
)
MongoDB provides the positional update operator for cases like this.
in my project i want to allow optional fields in a document, but i don't want to save any null values, i.e. i want to remove any field with null.
the values can be changed during run time.
i found how i can make a field null if the user didn't send data to update it (all the fields that the user send empty values for should get deleted).
if the user send firstName/lastName as an empty string in the form i want to remove them.
await Employee.findOneAndUpdate({ _id: employee._id },
{$set: {firstName: null, lastName: null, ...req.body.newEmployee}}, { new: true, upsert: false });
i tried to add an $unset option but i got an error
MongoError: Updating the path 'firstName' would create a conflict at 'firstName'
i thought about deleting it after the update (as a second command) but i can't find a way to tell/get all the null fields of the employee, and i can't get a fixed values to check because there are many combination for the null/not null values, especially if there will be more fields in the future.
i.e. i cant tell if (FN: null, LN: null or FN: "johny", LN: null etc..)
Update : In case if you need to keep some fields as is in existing document then try this, with this new code only the fields coming in request will either be updated or deleted doesn't alter other existing fields in document :
Your node.js code :
let removeObj = {}
Object.entries(req.body).forEach(([key, val]) => {
if (!val) { delete req[body][key]; removeObj[key] = '' };
})
let bulkArr = []
if (req.body) bulkArr.push({
updateOne: {
"filter": { "_id": ObjectId("5e02da86400289966e8ffa4f") },
"update": { $set: req.body }
}
})
if (Object.entries(removeObj).length > 0 && removeObj.constructor === Object) bulkArr.push({
updateOne: {
"filter": { "_id": ObjectId("5e02da86400289966e8ffa4f") },
"update": { $unset: removeObj }
}
})
// For mongoDB4.2 removeObj has to be an array of strings(field names)
let removeObj = []
Object.entries(req.body).forEach(([key, val]) => {
if (!val) { delete req[body][key]; removeObj.push(key) };
})
// After this, Similar to above you need to write code to exclude empty removeObj for 4.2 as well.
Query :: On mongoDB version >= 3.2 to < 4.2 .bulkWrite():
db.yourCollectionName.bulkWrite(bulkArr)
Query :: From mongoDB version 4.2 .updateOne accepts aggregation pipeline :
db.yourCollectionName.updateOne(
{ "_id": ObjectId("5e02da86400289966e8ffa4f") },
[
{
$set: req.body
},
{ $unset: removeObj }
]
)
Old Answer : You need to try .findOneAndReplace() , if you want entire doc to be replaced :
db.yourCollectionName.findOneAndReplace({_id: ObjectId("5e02da86400289966e8ffa4f")},inputObj, {returnNewDocument:true})
Your collection :
{
"_id" : ObjectId("5e02da86400289966e8ffa4f"),
"firstName" : "noName",
"lastName": 'noName',
"value" : 1.0,
"empDept": 'general',
"password":'something'
}
Your request object is like :
req.body = {
firstName: 'firstName',
lastName: null,
value : 1.0,
empDept: ''
}
your node.js code (Removes all falsy values ( "", 0, false, null, undefined )) :
let inputObj = Object.entries(req.body).reduce((a,[k,v]) => (v ? {...a, [k]:v} : a), {})
your collection after operation :
{
"_id" : ObjectId("5e02da86400289966e8ffa4f"),
"firstName" : "firstName",
"value" : 1.0,
}
your collection after operation as per updated answer :
{
"_id" : ObjectId("5e02da86400289966e8ffa4f"),
"firstName" : "firstName",
"value" : 1.0,
"password":'something'
}
I'm trying to delete a user id from all collections that have a reference to it. I'm bringing a user id across from the form and want to remove every reference to it in every business collection. I know the below query doesn't work but it shows my current approach.
db.collection('business', function (err, allBus){
allBus.update({}, { $pull: {followers: { userID } } } );
});
Here is my data, any ideas?
{
"_id" : ObjectId("55355d0ab063708c0b73809e"),
"address" : "Donegal",
"businessName" : "burkes shoes",
"email" : "info#burkes.ie",
"followers" : [
ObjectId("55300f5208224af428d1beaf"),
ObjectId("553129666252d2fc0a4634e4")
],
"gpsLat" : "55.1763595",
"gpsLong" : "-7.7923",
"homeDomain" : "www.burkes.ie",
"imgpath" : "\\images\\uploads\\57461Burkes_logo_1429560586607.jpg",
"password" : "1",
"role" : "business"
}
If userID is a string you will need to cast it first to ObjectID before using it in your query. Something like this should do the magic:
var ObjectID = require("mongodb").ObjectID,
userID = new ObjectId("55300f5208224af428d1beaf");
/*
if userID is a string then this will work
var userID = new ObjectId(userID);
*/
db.business.update(
{"followers": userID},
{
"$pull": { "followers": userID }
},
{ multi: true }
);
The query above will have better performance than an update without a query as it first filters documents that have in their followers array an element with the userID value and then updates the matched documents by pulling the ObjectID value from the array.